Whenever I run bleachbit , it doesn't work fully. It creates an error message. One of the message being ' You are not superuser'. Another message is 'Errno13'. Please guide in the matter.
I don't know about the second error, but the first one (unless you are already doing so) should be solved by running it as superuser by running it with this in Terminal (CTRL + ALT + T):
(It will prompt you then for a password, type it and press enter - for a security measure it will look like you are not typing anything, but you are.)
Alternatively you could run it as superuser by searching for the application
BleachBit (as root) and clicking on that as opposed to just the normal